Thanks for linking - I like it too! I relate to how she feels too - in having a robust ego and not needing others' validation all the time. And I actually think it's an important skill/state to achieve if you can, and one of the cornerstones of actually being happy.
I don't know if I agree that feminism hasn't had anything to offer - through my lifetime (now in my 50s) there has been a lot of feminist work to encourage girls to see themselves as capable, to not be put off any career by sexism - in the last 10-20 years, a lot of efforts in STEM in particular to do this. It's just that it tends to be drowned out by the "empower yourself by posing naked " "feminism" of mainstream media and culture. Feminists have also worked really hard to gain actual safe spaces, refuges for women, recognition of DV, and so on.
What I think is most empowering for girls is being encouraged to pursue what they want to do and what they are good at, having their rights to privacy and power over their own bodies reinforced and protected, being encouraged to be whatever kind of girl they want, whether feminine or not, straight or not, etc.
I think there is always backlash against any feminist gains and genderism is one form that takes, disguised as something progressive. It works against the idea that you could just be a girl who doesn't happen to fit a girly stereotype (or a boy likewise). But that hasn't happened alone - it's happened with the help of a huge societal increase in gender stereotyping via clothes, airbrushing, cosmetic surgery, etc.
And then on top of that there's the whole parenting issue where kids are brought up to feel nothing bad should ever happen to them and they should never have upset feelings - instead of raising children to cope with those things. But I'm not sure where that's come from (though I've seen it at first hand over the years since I've had DC)